Carburetor and the like



0%., 28, 1926. 1,612,352 Y J. W. BOEHNER CARBURETOR AND THE LIKEFiledsept. 25,

JOE-IN W'. BGEI-INER, E GEIICENNATI, OHIO.

OABBURETQR Alll? TEE LIKE Application filed September 23,. 1925. SerialNo. 52,166.

This iivention relates to carburetors, having particular reference toimproved throttle controlling means for the needle valve of carburetors.

The main object attained in my invention is a carbureto which is eiiective to produce relatively higher state of carburetion ot the uel gaswith a relatively smaller percentige of fuel to that of air in themixture.

it is common knowledge that with, motor hicles in which gasoline is usedfor genthe, motive power that, a large poron of the. fuel is wasted,varying in extent ore or less fixed relation to the degree of inperiector ineffective volatilization of his co stant waste of. fuel is not onlyan den to the, cost of operating the normal cost 01' the gasoline, it isticn of. waste which in its enormous 1 'regate tends to greatly increasethe price, 0 gasoline and tends further to hasten the time when thesupply will be unequal to the demand and the price prohibiti we to theaverage user.

This condition of low eilect-iveness of carburetion also gives rise toabnormal conditions or operation of the motore: :cessive formation ofcarbon and with it the common lmockingf of the motor, and a generalSluggishness of: operation or lack of responsive action which isessential to normally satisfactory performance of the vehicle.

lVhile the principle of my invention is not limited to any particularmake of carburetor or to carburetors used on any par ticular make ofautomobiles, the form of carburetor in which it is herein shown anddescribed is more especially adaptable for Ford automobiles, thein'iprovements making possible a more effective control of the relativesupply of gasoline and air to the carburetor, in starting the motor, inattaining speed and in the sustained operation of the motor at any speedof travel.

These functional objects are attained by mechanical means which arereadily adaptable to the common forms of carburetors used on Fordautomobiles, which are inexpensive of production and application andwhich are dependable for indefinite periods of operation withoutservicing attention.

As illustrated in the accompanying drawings:

Fig. 1 is a plan view of the improved carburetor;

Fig. 2 is a side elevation of the same partially in section;

Figs. 3 and l are details of the mechanism.

As here shown the features which are common to carburetors of thischaracter consist ot' a cast .hoi-ising 1, disposed in a horizontalplane. and adapted to be connected at the end to the intake manifold ofthe motor, the opposite end 3 being the air intake end, the

carburetor or inning chamber l being enied diametrically toward end 2.illG usual butterfly throttle valve, indicated in dotted outline at 5,isemployed at the manifold end of the carburetor, a similar valve 6.being employed at theoppositeend to regulate the supply of: air to themixing chamber. The fuel line is connected to afloat chamber indicatedin dotted outline in 2., the depending valve housing? into which thevalve seat Sis threaded, projecting into the char ber. Extendediupwardly from th main housing. 1, opposite housing is a valve stemsupporting housing 9 which is internally threaded as at 10 to: receivethe intermediate threaded. portion of the valve stem or needle 11, the.upper end of the housing being threaded to receive a split taperedsleeve nut 12 adapted to be adjusted in the housiny to the desiredextent tov form a suitable t' ictional bearing: for the needle. Theupper end of the needle normally has an oppositely extended connectingarm 13 secured thereto, the arm being eliminated in. the pres entconstruction, and the throttle butterfly valve 5. the usual connection14 having a stop projection 15 adapted to coact with the lug 16 securedin the main housing to limit the movement of the throttle valve in onedirection. A set screw 17 threaded into an upturned portion 18 of part1% acting against lug. 16 as an adjustable stop for the throttle valvein the opposite direction.

The toregoing detail parts are all comprised in the common type ofcarburetor here shown and are all the parts operatively associated withthe parts comprised in the invention which consist in a bracket 19shaped at its lower end to fit the portion 18 of connection 1% and to besecured thereto by the stop screw 17 a lock nut 20 acting to hold theparts firmly together and screw 17 in adjusted relation relative to lug16.

A lever 21 is pivoted to bracket 19 as indicated at 22, one end of thelever being formed as at 23 to support a rotatable stud 24 into which isthreaded an adjusting screw 25, the screw being supported in freerotative relation at its opposite end in an angular portion 26 ofbracket 19, a lock nut 27 acting to hold the screw in its adjustedrelation to stud 24, thus to determine the angle of lever 21 relative tothe throttle valve 14:.

Lever 21 is connected to a lever 28 secured to the needle valve stem 11by a set screw as at 29, by means of a stud 30 lixed in the end of thelever 21 and a slot 31 in the free end on the lever 28 to adapt thelever to coact one with the other on both sides of their common centerline thus to efiect the regulative relation between the throttle andneedle valves defined in the statement of functions attained in thepractice of the invention and more particularly as follows:

The construction as described. connects the needle valve stem with thethrottle valve in a manner which synchronizes the action of the twovalves and is therefore effective to regulate the relative portions ofgasoline and air combined in th carburetor.

l/Vhen the throttle valve lever 14 is in the full line positionindicated in Fig. 1, the valve will be full open and the needle valve 11will be at its lowest point of adjustment relative to valve seat 8,which will result in a lean mixture in the carburetor at this point ofadjustment composed of the minimum portion of gasoline and the maximumportion of air. This is the adjustment effected by the throttle valvecontrols, from the steernig wheel or foot accelerator, for speed operation of the vehicle. When the lever is in the opposite extreme positionindicated by the dotted outline of the lever, the throttle valve will befull closed and the needle valve will be at its highest point ofadjustment relative valve seat 8, which will result in a rich mixture,composed of the maximum portion 0;": gasoline and the minimum portion ofair. This is the condition of adjustment of the valves for starting themotor,

ariable compensating adjustments of the valves being made bymanipulation of the throttle valve controls at intermediate pointsbetween the two extreme positions of the valves as described.

It will be understood that as the throttle valve is moved, from the fullclosed position in any degree toward the full open position and viceversa, the needle valve will be accordingly and compensatingly movedtoward the lowest or highest point of adjustment according to theadjustment of the throttle valve. Thus the relative portions of gasolineand air will be maintained at all times according to a serviceadjustment of the carburetor conditioned upon a test of the motor.

When it is understood that in standard equipment of Ford automobiles theneedle valve, upon being adjusted to a condition of the motor, remainsfixed without reference to the adjustments of the throttle incident todriving, the valve of an eliective invention of tie character hereindescribed, and its influence on fuel economy and improved operatingconditions of the motor will be apparent.

Having described my invention, I claim:

1. A carburetor including in combination an adjustable needle valve stemand a ti rottle valve operable on an axis parallel with the needle valvestem, a bell crank lever fixed to the throttle valv stem, an arm securedto the needle valve stem, a bracket secured to the bell crank lever, anarm pivoted medially on said bracket, having a stud rotatably supportedat one end, an adjusting screw supported in said bracket and threadedinto said stud, the arm being connected at its free end with the needlevalve arm to adapt the needle valve and the throttle valve to beadjusted simultaneously compensatingly one relative to the other.

2. A carburetor including in combination an adjustable needle valve stemand a throttle valve operable on an axis parallel with the needle valvestem, a bell crank lever fixed to the throttle valve stem havingopposite stops acting to limit the movement of the valve, an arm securedto the needle valve stem. a bracket extended upwardly from the bellcrank, having its lower portion shaped to be secured to one of saidstops, a pivotally adjustable arm supported on the upper portion of saidbracket and connected compensatingly radially with the needle valve armwhereby to adjust said valves simultaneously one relative to the other.

In testimony whereof, I affix my signature.

JOHN W. BOEHNER.

